Debug Configuration Reference (DebugBundle)

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Read the updated version of this page for Symfony 7.1 (the current stable version).

The DebugBundle integrates the VarDumper component in Symfony applications. All these options are configured under the debug key in your application configuration.

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# displays the default config values defined by Symfony
$ php bin/console config:dump-reference framework

# displays the actual config values used by your application
$ php bin/console debug:config framework

# displays the config values used by your application and replaces the
# environment variables with their actual values
$ php bin/console debug:config --resolve-env framework

6.2

The --resolve-env option was introduced in Symfony 6.2.

Note

When using XML, you must use the http://symfony.com/schema/dic/debug namespace and the related XSD schema is available at: https://symfony.com/schema/dic/debug/debug-1.0.xsd

Configuration

max_items

type: integer default: 2500

This is the maximum number of items to dump. Setting this option to -1 disables the limit.

min_depth

type: integer default: 1

Configures the minimum tree depth until which all items are guaranteed to be cloned. After this depth is reached, only max_items items will be cloned. The default value is 1, which is consistent with older Symfony versions.

max_string_length

type: integer default: -1

This option configures the maximum string length before truncating the string. The default value (-1) means that strings are never truncated.

dump_destination

type: string default: null

Configures the output destination of the dumps.

By default, dumps are shown in the WebDebugToolbar when returning HTML. Since this is not always possible (e.g. when working on a JSON API), you can have an alternate output destination for dumps. Typically, you would set this to php://stderr:

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# config/packages/debug.yaml
debug:
    dump_destination: php://stderr

Configure it to "tcp://%env(VAR_DUMPER_SERVER)%" in order to use the ServerDumper feature.

This work, including the code samples, is licensed under a Creative Commons BY-SA 3.0 license.
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